Can I switch my 3G with my boss's 3GS?

I have a 16GB 3G iPhone and must wait until 12/31/09 to be eligible for subsidized 3GS pricing. My boss (not an AT&T customer as far as I know, and definitely does not have an iPhone) wants to get an iPhone next week. If he purchases a new 3GS can I give him my 3G, and just swap out the SIM cards so I don't have to wait until 12/31/09?

Thats fair but your just thinking about yourself and not your boss.
Even if he is okay about it.

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Well, it WAS his idea. I wasn't asking for opinions on whether it was morally right or wrong. Besides, it's not like the 3G is such an incredibly inferior product which is rendered useless once the 3GS comes out.

I should mention he will be paying for mine either way (he bought my current 3G), so if he gives me his 3GS now, he only has to buy one phone. Otherwise, I just end up costing the company another phone in December

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